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* DOM Renderer for Coherent.js
*
* Provides client-side DOM rendering with hydration support.
* Extends BaseRenderer for shared functionality.
*/
import { BaseRenderer } from './base-renderer.js';
import {
isCoherentObject,
hasChildren,
getChildren
} from '../core/object-utils.js';
import { VDOMDiffer } from './vdom-diff.js';
/**
* DOM Renderer class - extends BaseRenderer for shared functionality
*/
export class DOMRenderer extends BaseRenderer {
constructor(options = {}) {
// Call parent constructor with DOM-specific defaults
super({
enableHydration: true,
maxDepth: 100, // Lower depth for DOM rendering
enableVDOMDiff: options.enableVDOMDiff !== false, // Enable VDOM diffing by default
...options
});
// Set up utilities for easy access
this.utils = {
isCoherentObject,
hasChildren,
getChildren
};
// Initialize virtual DOM differ for efficient updates
if (this.config.enableVDOMDiff) {
this.vdomDiffer = new VDOMDiffer();
this.componentCache = new Map(); // Cache previous component states
}
}
/**
* Render component to DOM element
*/
render(component, container = null) {
this.resetMetrics();
this.metrics.startTime = performance.now();
try {
const element = this.renderComponent(component, {}, 0);
if (container && element) {
// Clear container first if hydration is disabled
if (!this.config.enableHydration) {
container.replaceChildren();
}
container.appendChild(element);
}
this.metrics.endTime = performance.now();
return element;
} catch (error) {
this.recordError('render', error);
console.error('Error rendering to DOM:', error);
throw error;
}
}
/**
* Render component to DOM element (overrides BaseRenderer method)
*/
renderComponent(component, options = {}, depth = 0) {
// Use parent validation
this.validateDepth(depth);
this.metrics.elementsProcessed++;
// Handle different component types
if (component === null || component === undefined) {
return document.createTextNode('');
}
if (typeof component === 'string') {
return document.createTextNode(component);
}
if (typeof component === 'number' || typeof component === 'boolean') {
return document.createTextNode(String(component));
}
if (typeof component === 'function') {
// Execute function components using parent method
const result = this.executeFunctionComponent(component, depth);
return this.renderComponent(result, options, depth + 1);
}
if (Array.isArray(component)) {
// Create a fragment for multiple elements
const fragment = document.createDocumentFragment();
component.forEach(child => {
const childElement = this.renderComponent(child, options, depth + 1);
if (childElement) {
fragment.appendChild(childElement);
}
});
return fragment;
}
// Handle object-based components
return this.renderObjectElement(component, depth);
}
/**
* Render object-based element to DOM
*/
renderObjectElement(component, depth) {
if (!this.utils.isCoherentObject(component)) {
return document.createTextNode(''); // Skip invalid objects
}
// Process object-based component (expects single element)
const entries = Object.entries(component);
if (entries.length > 0) {
const [tagName, props] = entries[0];
return this.renderDOMElement(tagName, props, depth + 1);
}
return document.createTextNode('');
}
/**
* Render a single DOM element
*/
renderDOMElement(tagName, props, depth) {
// Create element with namespace support
const element = this.config.namespace
? document.createElementNS(this.config.namespace, tagName)
: document.createElement(tagName);
// Set attributes
this.setDOMAttributes(element, props);
// Handle text content
if (props && props.text !== undefined) {
const text = typeof props.text === 'function' ? props.text() : props.text;
element.textContent = String(text);
}
// Handle children
if (props && this.utils.hasChildren(props)) {
const children = this.utils.getChildren(props);
if (Array.isArray(children)) {
children.forEach(child => {
const childElement = this.renderComponent(child, {}, depth + 1);
if (childElement) {
element.appendChild(childElement);
}
});
} else if (children) {
const childElement = this.renderComponent(children, {}, depth + 1);
if (childElement) {
element.appendChild(childElement);
}
}
}
return element;
}
/**
* Set DOM attributes from props
*/
setDOMAttributes(element, props) {
if (!props || typeof props !== 'object') return;
const skipProps = ['text', 'children'];
for (const [key, value] of Object.entries(props)) {
if (skipProps.includes(key) || value === undefined || value === null) {
continue;
}
if (typeof value === 'function') {
// Handle event listeners
if (key.startsWith('on')) {
// Normalize DOM event names to lowercase (e.g., onClick -> 'click')
const eventType = key.slice(2).toLowerCase();
// Store listener reference for potential cleanup
element.addEventListener(eventType, value);
element._listeners = element._listeners || [];
element._listeners.push({ type: eventType, handler: value });
}
continue;
}
if (key === 'class' || key === 'className') {
element.className = String(value);
} else if (typeof value === 'boolean') {
if (value) {
element.setAttribute(key, '');
} else {
element.removeAttribute(key);
}
} else {
element.setAttribute(key, String(value));
}
}
}
/**
* Update existing DOM element with new component using virtual DOM diffing
*/
update(element, newComponent, componentId = 'default') {
if (!this.config.enableVDOMDiff || !this.vdomDiffer) {
// Fallback to full re-render
return this.render(newComponent, element.parentNode);
}
const oldComponent = this.componentCache.get(componentId);
if (!oldComponent) {
// First render, cache the component and render normally
this.componentCache.set(componentId, newComponent);
return this.render(newComponent, element.parentNode);
}
// Perform virtual DOM diffing
try {
const patchCount = this.vdomDiffer.update(element, oldComponent, newComponent);
// Update cache with new component
this.componentCache.set(componentId, newComponent);
// Log performance metrics
if (this.config.enableMonitoring) {
this.metrics.patchesApplied = (this.metrics.patchesApplied || 0) + patchCount;
}
return element;
} catch (error) {
console.warn('VDOM diffing failed, falling back to full re-render:', error);
// Clear corrupted cache entry
this.componentCache.delete(componentId);
// Fall back to full re-render
return this.render(newComponent, element.parentNode);
}
}
/**
* Clear component cache (useful for development or memory management)
*/
clearCache() {
if (this.componentCache) {
this.componentCache.clear();
}
if (this.vdomDiffer) {
this.vdomDiffer.clearCache();
}
}
/**
* Get cache statistics
*/
getCacheStats() {
return {
componentsCached: this.componentCache ? this.componentCache.size : 0,
vdomCached: this.vdomDiffer ? this.vdomDiffer.cache.size : 0,
patchesApplied: this.metrics.patchesApplied || 0
};
}
}
/**
* Main DOM render function - converts object components to DOM elements
*/
export function renderToDOM(component, container = null, options = {}) {
const renderer = new DOMRenderer(options);
return renderer.render(component, container);
}
/**
* Update DOM element with new component using virtual DOM diffing
*/
export function updateDOM(element, newComponent, componentId, options = {}) {
const renderer = new DOMRenderer(options);
return renderer.update(element, newComponent, componentId);
}
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